Analysis of etiological surveillance results of influenza in Chuxiong prefecture from 2017 to 2022
10.3760/cma.j.cn112866-20230831-00026
- VernacularTitle:楚雄州2017—2022年流感病原学监测结果分析
- Author:
Chunjiao PENG
1
;
Silei ZHOU
;
Lu ZHOU
;
Yunquan DUAN
;
Haimei HU
;
Qineng DING
;
Jiayun WANG
Author Information
1. 楚雄州疾病预防控制中心，楚雄 675000
- Keywords:
Influenza virus;
Surveillance;
Virus isolation and culture;
Result analysis
- From:
Chinese Journal of Experimental and Clinical Virology
2023;37(6):618-622
- CountryChina
- Language:Chinese
-
Abstract:
Objective:The result of influenza etiology surveillance in Chuxiong prefecture were analyzed to master the epidemic characteristics of influenza virus and provide scientific basis for influenza prevention and control.Methods:Real-time PCR assay and MDCK cell culture method were used to detect and separate influenza virus nucleic acids from influenza-like cases (ILI) and suspected influenza cases from 2017 to 2022 come from the sentinel hospitals.Results:From 2017 to 2022, a total of 7 302 cases of ILI and 1 079 cases were detected positive, with a positive rate of 14.78%. The positive rate in the six years was 14.71%、15.44%、20.11%、5.04%、10.90% and 21.08%, and the positive rate in 2020 was the lowest. Among them, the positive rate of influenza A was higher than that of influenza B, and higher in spring and winter than in summer and autumn., One H9N2 human infected with avian influenza virus was detected positive.The outbreak cases were mainly influenza B, followed by influenza A H3N2, and students were susceptible to it. The proportion of influenza-like cases in the 0~5 year old group was the highest (64.16%), and the protortion in 60~year old group was the lowest (0.05%).Conclusions:From 2017 to 2022, influenza A was predominant in Chuxiong prefecture, with high prevalence in winter and spring. The influenza strains presented diversity and each strain circulated alternately. The implementation of COVID-19 prevention and control measures can effectively reduce the infection rate of influenza virus .In addition, there are human cases of avian influenza infection in Chuxiong prefecture. So the surveillance of influenza-like cases should be strengthened an improved, and to expand the monitoring of human and avian influenza.
